INCOME AND MINING TAXES - Non Operating Losses (Details) $ in Thousands	Dec. 31, 2019 USD ($)
United States
INCOME TAXES
Net-operating losses	$ 129,409
Mexico
INCOME TAXES
Net-operating losses	34,876
Canada
INCOME TAXES
Net-operating losses	36,692
Argentina
INCOME TAXES
Net-operating losses	$ 41,922